ECD SYSTEM (w/o EGR Cooler Bypass Valve), Diagnostic DTC:P0093

DTC Code	DTC Name
P0093	Fuel System Leak Detected - Large Leak

DESCRIPTION

Refer to the system description Click here

DTC No.	DTC Detection Condition	Trouble Area
P0093	Fuel leaks in high-pressure areas (1 trip detection logic)	Fuel line between supply pump and common rail Fuel line between common rail and each injector Suction control valve Common rail Injectors Pressure discharge valve Open or short in EDU circuit (P0200 set simultaneously) Open or short in injector circuit EDU (P0200 set simultaneously) ECM

DTC No.

DTC Detection Condition

Trouble Area

P0093

Fuel leaks in high-pressure areas

(1 trip detection logic)

Fuel line between supply pump and common rail
Fuel line between common rail and each injector
Suction control valve
Common rail
Injectors
Pressure discharge valve
Open or short in EDU circuit (P0200 set simultaneously)
Open or short in injector circuit
EDU (P0200 set simultaneously)
ECM

Tech Tips

DTC P0093 can be detected if the problem occurs when the engine idles for 1 minute and then it runs at 2,500 rpm for 30 seconds.
For more information on the common rail system, refer to the system description Click here.
If P0093 is present, refer to the "Diagnostic Trouble Codes (DTCs) Table for the Common Rail System" Click here.

When DTC P0093 is set, check the internal fuel pressure of the common rail by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Fuel Press.

Standard

Engine Speed	Fuel Pressure
Idling	Approximately 30 to 40 MPa
3,000 rpm (No engine load)	Approximately 85 to 105 MPa

MONITOR DESCRIPTION

P0093 (Fuel leaks in high-pressure areas):

This DTC indicates fuel leaks that exist in high pressure areas in the common rail system. The ECM constantly monitors the internal fuel pressure of the common rail after the engine is started. The ECM sets this DTC if the drop in the internal fuel pressure is large when injecting the fuel.

In the common rail system, high-pressure fuel is always supplied to the high-pressure areas including the supply pump, common rail, injectors and piping. The ECM adjusts the suction control valve opening angle to obtain the target internal fuel pressure.

If this DTC is set, the ECM enters fail-safe mode. The fail-safe mode suspends both fuel injection and supply pump operation, and then stops the engine. Before stopping the engine, the ECM permits the vehicle to be driven for 1 minute. The fail-safe mode continues until the ignition switch is turned OFF.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

Note

After replacing an injector, the ECM needs registration Click here.

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0093)

Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Select the following menu items: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result

Display (DTC Output)	Proceed to
P0093	A
P0093 and P1238	B
P0093 and P0200 and/or P1271	C

READ VALUE USING INTELLIGENT TESTER (COMPENSATORY INJECTION VOLUME FOR EACH CYLINDER) Click here

GO TO DTC CHART

CHECK FUEL LEAK (IN HIGH-PRESSURE FUEL PARTS AND AREAS)
1. Visually check the supply pump, each injector and fuel line located between the supply pump and common rail for fuel leaks or fuel pressure leaks. Also, perform the same check on the fuel lines between the common rail and each injector.
  
  Tech Tips
  
  There is possibility that fuel leaks inside the components (supply pump, etc.) have occurred.
  
  OK
  
  No leakage
NG
REPAIR OR REPLACE FUEL LEAKAGE POINT

OK
READ VALUE USING INTELLIGENT TESTER (COMPENSATORY INJECTION VOLUME FOR EACH CYLINDER)
1. Connect the intelligent tester to the DLC3.
2. Start the engine and turn the tester ON.
3. Select the following menu items: Powertrain / Engine and ECT / Data List / Injection Feedback Val #1, #2, #3 and #4.
4. Read the values.
  
  Standard value
  
  Compensatory injection volume is between -4.9 mm³ and 4.9 mm³.
  Tech Tips
  - If the injector is malfunctioning, the compensatory injection volume remains between -5.0 mm³and 5.0 mm³.
  - The compensatory injection volume is usually between -3.0 mm³and 3.0 mm³.
NG
REPLACE INJECTOR ASSEMBLY

OK
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FUEL LEAK TEST)
1. Connect the intelligent tester to the DLC3.
2. Start the engine and turn the tester ON.
3. Select the following menu items: Powertrain / Engine and ECT / Active Test / Test the Fuel Leak.
4. Perform the active test.
5. Check for fuel leaks in the high-pressure areas.
NEXT

OK
No leakage

Standard value
Compensatory injection volume is between -4.9 mm³ and 4.9 mm³.

CHECK WHETHER DTC OUTPUT RECURS (DTC P0093)

Tech Tips

After clearing the DTC, let the engine idle for 1 minute and then run it at 2,500 rpm for 30 seconds.
At the same time, check the fuel pressure inside the common rail by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Fuel Press.
The internal fuel pressure of the common rail must be stable under each driving condition.

Standard

Engine Speed	Fuel Pressure (MPa)
Idling	Approximately 30 to 40 MPa
3,000 rpm (No engine load)	Approximately 85 to 105 MPa

END